Project/Area Number  07455079 
Research Category 
GrantinAid for Scientific Research (B)

Section  一般 
Research Field 
Fluid engineering

Research Institution  TOHOKU UNIVERSITY 
Principal Investigator 
KAMIYAMA Shinichi Tohoku Univ., Inst.Fluid Sci., Professor, 流体科学研究所, 教授 (80006171)

CoInvestigator(Kenkyūbuntansha) 
OYAMA Tadamasa Tohoku Univ., Inst.Fluid Sci., Assistant, 流体科学研究所, 助手 (80006189)
UENO Kazuyuki Tohoku Univ., Inst.Fluid Sci., Assistant, 流体科学研究所, 助手 (20250839)
NISHIYAMA Hideya Tohoku Univ., Inst.Fluid Sci., Associate Prof., 流体科学研究所, 助教授 (20156128)

Project Fiscal Year 
1995 – 1996

Project Status 
Completed(Fiscal Year 1996)

Budget Amount *help 
¥7,500,000 (Direct Cost : ¥7,500,000)
Fiscal Year 1996 : ¥2,500,000 (Direct Cost : ¥2,500,000)
Fiscal Year 1995 : ¥5,000,000 (Direct Cost : ¥5,000,000)

Keywords  Magnetic fluid / Magnetic field / Damper / Oscillatory flow / Actuator / Fine particles / Aggregates / 磁性流体 / 磁場 / ダンパ / 振動流 / アクチュエータ / 微粒子 / 凝集 / 沸騰二相流 
Research Abstract 
The following three items has been investigated during 2 years from April, 1995. (1) Effect of magnetic field on the pressure characteristics of oscillatory pipe flow Theoretical and experimental studies were conducted to clarify the effect of applied nonuniform magnetic field on the oscillatory pipe flow of magnetic fluid. In the theoretical analysis, new model of particles dispersion is proposed. Namely, it is a nonunifom particle dispersion model as a function of magnetic field strength which is different from the old models as the uniform particle dispersion model or chainlike cluster model. The equations for solving the oscillatory flow of magnetic fluid are constructed and solved. The results explain well the experimental data of pressure dependence on the magnetic field and oscillating frequency. (2) Boiling twophase flow characteristics of magnetic fluid As a basic study of the development of new energy conversion system using magnetic fluid, the investigations of gasliquid twophase pipe flow of magnetic fluid under a nonuniform magnetic field are conducted. It is clarified that use of twophase flow is effective to increase in the driving force of the fluid. Also, threhold condition of instability occurrence of pressure fluctuation is clarified. (3) Unsteady flow around a circular cylinder with magnetic fluid coating In order to decrease in the drag acting on the cylinder and increase in the heat transfer from the cylinder, numerical simulation of flow around a circular cylinder is conducted. It is clarified that the unsymmetrical distribution of magnetic field around the cylinder is possible effectively to change the pressure and temperature distributions around the cylinder. Also, unsteady flow pattern is obtained.
